科研之友
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摘要
Er3+/Yb3+ co-doped transparent glass ceramics containing Na3.6Y1.8(PO4)(3) crystals were prepared by high-temperature melting and subsequent heat treatment the precursor glass, and their up-conversion luminescent properties were investigated. The optimum heat treatment condition of glass at 630 degrees C for 2 h were determined by a series of experimental results, and confirmed the existence of Na3.6Y1.8(PO4)(3) crystals in glass ceramics. The up-conversion luminescence spectra of the glass ceramic samples under pulsed excitation at 980 nm revealed luminescence bands corresponding to Er3+ ion transitions in the green (F-4(7/2)-I-4(15/2), H-2(12/2)-I-4(15/2),S-4(3/2)-I-4(15/2)) and red (F-4(9/2) -I-4(15/2)) spectral regions. The fluorescence spectra reaches a maximum when the molar ratio of Er2O3 to Yb2O3 is 1: 7. Luminescence quantum yield of the samples was measured by using an integrating sphere. The transmission spectra proved that the glass ceramics sample still maintained a high transparency up to 83% in the visible region.
